A scorching heat wave driven by an expanding heat dome is expected to envelop around 70 million people in the central United States. This intense weather pattern is creating hazardous conditions, with rising temperatures pushing into the triple digits across numerous states, including those in the Rockies and Plains. Extreme heat warnings have been issued as forecasters anticipate that areas like Mississippi could reach 100 degrees. The heat has already raised energy demand and could contribute to power grid strains. Residents are advised to stay informed and prepared as the dangerous heat persists through the weekend, with little relief in sight.